Shape dependence of support for NOx storage and reduction catalysts

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 水污染控制实验室

	Shape dependence of support for NOx storage and reduction catalysts
	Xie, Wen ; Yu, Yunbo ; He, Hong
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2019
卷号	75 页码:396-407
关键词	NOx storage and reduction Pt/BaO/Al2O3 Nanorod Morphology effect Strong interaction
ISSN号	1001-0742
英文摘要	Pt/BaO/Al2O3 catalysts with different BaO loadings prepared from Al2O3 nanorods (Pt/BaO/ Al2O3-nr) and irregular Al2O3 nanoparticles (Pt/BaO/Al2O3-np) were investigated for NOx storage and reduction (NSR). The Pt/BaO/Al2O3 materials derived from Al2O3 nanorods always exhibited much higher NOx storage capacity (NSC) over the whole temperature range of 100-400 degrees C than the corresponding Pt/BaO/Al2O3-np samples containing the same BaO loading, giving the maximum NSC value of 966.9 mu mol/gcat at 400 degrees C, 1.4 times higher than that of Pt/BaO/Al2O3-np. Higher catalytic performance of nanorod-supported NSR samples was also observed during lean-rich cyclic conditions (90 sec vs. 5 sec), giving more than 98% NOx conversion at 300-450 degrees C over the Pt/BaO/Al2O3-nr sample with 15% BaO loading. To reveal this dependence on the shape of the support during the NSR process, a series of characterization techniques including the Brunauer-Emmett-Teller (BET) method, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2 temperature programmed reduction (H2-TPR), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were also conducted. It was found that intimate contact of Ba-Al and Ba-Pt sites was achieved over the Pt/BaO/Al2O3 surface when using Al2O3-nr as a support. This strong interaction among the multi-components of Pt/BaO/Al2O3-nr thus triggered the formation of surface nitrite and nitrate during the lean period, and also accelerated the reverse spillover of ad-NOx species onto the Pt surface, enhancing their reduction and leading to high NSR performance. (c) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43277]
专题	生态环境研究中心_水污染控制实验室
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China
推荐引用方式 GB/T 7714	Xie, Wen,Yu, Yunbo,He, Hong. Shape dependence of support for NOx storage and reduction catalysts[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2019,75:396-407.
APA	Xie, Wen,Yu, Yunbo,&He, Hong.(2019).Shape dependence of support for NOx storage and reduction catalysts.JOURNAL OF ENVIRONMENTAL SCIENCES,75,396-407.
MLA	Xie, Wen,et al."Shape dependence of support for NOx storage and reduction catalysts".JOURNAL OF ENVIRONMENTAL SCIENCES 75(2019):396-407.